package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){
    }
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint)  {
        log.info("开始进行填充");
        //执行的时候拦截到mapper的update和insert方法,给createTime和updateTime赋值
       //1.获取方法上数据库操作的类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType value = annotation.value();
        //2.获取拦截的参数
        Object[] args = joinPoint.getArgs();
        if (args==null || args.length==0){
            return;
        }
        Object arg = args[0];
        //3.根据数据库操作类型，给对应的属性进行赋值
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        switch (value){
            case INSERT:
                //反射赋值
                try {
                    Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                    Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                    Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    setCreateTime.invoke(arg,now);
                    setCreateUser.invoke(arg,currentId);
                    setUpdateTime.invoke(arg,now);
                    setUpdateUser.invoke(arg,currentId);
                } catch (NoSuchMethodException e) {
                    throw new RuntimeException(e);
                } catch (InvocationTargetException e) {
                    throw new RuntimeException(e);
                } catch (IllegalAccessException e) {
                    throw new RuntimeException(e);
                }
                break;
            case UPDATE:
                 //反射赋值
                try {
                    Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                    Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                    setUpdateTime.invoke(arg,now);
                    setUpdateUser.invoke(arg,currentId);
                } catch (NoSuchMethodException e) {
                    throw new RuntimeException(e);
                } catch (InvocationTargetException e) {
                    throw new RuntimeException(e);
                } catch (IllegalAccessException e) {
                    throw new RuntimeException(e);
                }
                break;
        }
    }
}
